Interlock required for every DUI conviction (min 1 year; longer on repeats); the Ignition Interlock License lets almost any offender keep driving immediately with IID + SR-22 — one of the most IID-forward states.
By offense
First offense: IID required — IID required for all DUI convictions, minimum 1 year.
Second offense: IID required
Third offense: IID required
Fourth+ offense: IID required
Statute: RCW 46.20.385, 46.20.720
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